ORA-03135: connection lost contact
1) Server unexpectedly terminated or was forced to terminate.
2) Server timed out the connection.
1) Check if the server session was terminated.
2) Check if the timeout parameters are set properly in sqlnet.ora.
Reference: http://docs.oracle.com/cd/B28359_01/ser ... #ORA-03135
ORA-03135 occurs when we try to connect oracle database and the connection gets time out. ORA-03135 can also be caused by the firewall when connecting remotely.
To resolve ORA-03135 exception we need to increase the value of the expire_time parameter in the SQLNET.ORA file. SQLNET.ORA file is located under $ORACLE_HOME/network/admin/. If possible set to SQLNET.EXPIRE_TIME = 10. And retry the backup.
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